The HI-7001M is a 230 mL bottle of 1.68 pH buffer solution

Plating bath samples, food samples and waste samples are often acidic in nature. To increase accuracy of your measurement at lower pH, it is important to calibrate your electrode and meter at that pH also.

The HI-7001M pH 1.68 buffer is available to fulfil this requirement. This pH 1.68 buffer solution allows you to calibrate your measurement system in the acid pH range and bracket your acidic samples by using a second value at 4.01 pH or near 7.01 pH.